Protocol Registries

Protocol parameter registries represent the authoritative record of many of the codes and numbers contained in a variety of Internet protocols. We maintain these records in compliance with the associated technical standards and allocation policies, and we provide this service in coordination with the Internet Engineering Task Force (IETF).

To view or download individual protocol registries, navigate to the individual registries through the index below. Registry data is available for bulk retrieval via Rsync (recommended) or FTP.

To obtain a registration in an existing registry, or to modify existing registrations, consult the relevant application form. For information on creating new registries, please see RFC 8126 for guidance.

Protocol/Registry	Defining Document/Comments
Access Node Control Protocol (ANCP)
ANCP Capability Types RFC 6320 Standards Action
ANCP Command Codes RFC 6320 Standards Action
ANCP Message Types RFC 6320 Standards Action
ANCP Port Management Functions RFC 6320 Standards Action
ANCP Result Codes RFC 6320 0x0-0xFFF: IETF Review. 0x1000-0xFFFFFF: Specification Required.
ANCP Technology Types RFC 6320 Expert Review
ANCP TLV Types RFC 6320 0x0000-0x1FFF: IETF Review. 0x2000-0xFFFF: Specification Required.
Joint GSMP / ANCP Version Registry RFC 6320 Standards Action
ACL TLS
ACL (D)TLS Parameters RFC 9761 Expert Review Dan Wing Per Andersson
ACL DTLS Version Codes RFC 9761 Expert Review Dan Wing Per Andersson
ACL TLS Version Codes RFC 9761 Expert Review Dan Wing Per Andersson
Ad Hoc On Demand Distance Vector (AODV) Parameters
AODV Extension Types RFC 3561 Standards Action
AODV Message Types (for messages sent to port 654) RFC 3561 Standards Action
Address Family Numbers
Address Family Numbers RFC 2453, RFC 2677, RFC 2858 1-16383: Standards Action. 16384-32767: First Come First Served.
Address Resolution Protocol (ARP) Parameters
Hardware Types RFC 826, RFC 5494 requests for values below 256: Expert Review. requests for more than one value: Expert Review. requests for one value greater than 255: First Come First Served. requests for one value, no value specified: First Come First Served. Carlos Pignataro
Operation Codes RFC 826, RFC 5494 IETF Review or IESG Approval
Protocol Type RFC 826, RFC 5494, RFC 5342 The Ethertype space is administered as described in [RFC5342].
APEX Parameters
Applicable Exchange Core (APEX) Endpoint Applications RFC 3340 Expert Review
Applicable Exchange Core (APEX) Options RFC 3340 Expert Review
Applicable Exchange Core (APEX) Services RFC 3340 Expert Review
Application Access Protocol (ACAP) Numbers
ACAP Capabilities RFC 2244 Specification Required
ACAP Response Codes RFC 2244 First Come First Served
Dataset Classes RFC 2244 Standards Action or IESG-Approved Experimental RFC
Vendor Subtrees RFC 2244, RFC 6075 First Come First Served
Application Bridging for Federated Access Beyond Web (ABFAB) Parameters
ABFAB URN Parameters RFC 7833 IETF Review or Expert Review
Application-Layer Traffic Optimization (ALTO) Protocol
ALTO Address Types RFC 7285 IETF Review
ALTO Cost Metrics RFC 7285 IETF Review
ALTO Cost Modes RFC 9274 IETF Review
ALTO Cost Source Types RFC 9439 IETF Review
ALTO Endpoint Property Types RFC 7285 IETF Review
ALTO Entity Domain Types RFC 9240 IETF Review
ALTO Entity Property Types RFC 9240 IETF Review
ALTO Error Codes RFC 7285 IETF Review
Authenticated Encryption with Associated Data (AEAD) Parameters
AEAD Algorithms RFC 5116 1-32767: Specification Required. 32768-65535: Private Use. David McGrew Bjoern Tackmann Stanislav Smyshlyaev
Authentication and Authorization for Constrained Environments (ACE)
ACE Authorization Server Request Creation Hints RFC 9200 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action. 256 to 65535: Specification Required. greater than 65535: Expert Review. Göran Selander
ACE Groupcomm Errors RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Groupcomm Key Types RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Groupcomm Parameters RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Groupcomm Policies RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Groupcomm Profiles RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Groupcomm Rekeying Schemes RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
ACE Profiles RFC 9200 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action. 256 to 65535: Specification Required. greater than 65535: Expert Review. Göran Selander
ACE Token Revocation List Errors RFC 9770 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Marco Tiloca Marco Rasori
ACE Token Revocation List Parameters RFC 9770 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Marco Tiloca Marco Rasori
Group OSCORE Admin Permissions draft-ietf-ace-oscore-gm-admin-17 0-65535: Expert Review. greater than 65535: Private Use.
Group OSCORE Roles draft-ietf-ace-key-groupcomm-oscore-21 0-65535: Expert Review. greater than 65535: Private Use.
OAuth Access Token Type CBOR Mappings RFC 9200 less than -65536: Private Use. -65536 or greater: Expert Review. Göran Selander
OAuth Error Code CBOR Mappings RFC 9200 less than -65536: Private Use. -65536 or greater: Expert Review. Göran Selander
OAuth Grant Type CBOR Mappings RFC 9200 less than -65536: Private Use. -65536 or greater: Expert Review. Göran Selander
OAuth Parameters CBOR Mappings RFC 9200 less than -65536: Private Use. -65536 or greater: Expert Review. Göran Selander
OAuth Token Introspection Response CBOR Mappings RFC 9200 less than -65536: Private Use. -65536 or greater: Expert Review. Göran Selander
OSCORE Security Context Parameters RFC 9203 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Göran Selander
Sequence Number Synchronization Methods RFC 9594 less than -65536: Private Use. -65536 to -257: Specification Required. -256 to 255: Standards Action With Expert Review. 256 to 65535: Specification Required. greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Marco Tiloca Rikard Höglund
Authentication and Key Agreement (AKA)
AKA-Version Namespace RFC 3310 Expert Review Vesa Torvinen (primary) Jari Arkko (secondary)
Authentication Method Reference Values
Authentication Method Reference Values RFC 8176 Expert Review John Bradley Mike Jones
Authentication Option Name Spaces
Algorithm Name Space Values RFC 3118 IETF Review
Protocol Name Space Values RFC 3118 IETF Review
RDM Name Space Values RFC 3118 IETF Review
Authentication, Authorization, and Accounting (AAA) Parameters
Application IDs RFC 6733, RFC 6942 0-16777215: Specification Required. 16777216-4294967294: First Come First Served.
AVP Codes RFC 6733 block allocation (release of more than three AVPs at a time for a given purpose): IETF Review. other allocation: Specification Required. Lionel Morand (primary) Jouni Korhonen (secondary)
AVP Flags Value RFC 6733 Standards Action
AVP Specific Values RFC 6733 IETF Review (unless otherwise specified)
Command Codes RFC 6733, RFC 5719 0-255: Reserved for RADIUS backward compatibility. 256-8388607: IETF Review. 8388608-16777213: First Come First Served with specification.
Command Flags RFC 6733 Standards Action
Mobility Capability Registry RFC 5447 Specification Required Jouni Korhonen
QoS Profiles RFC 5624 0-511: Standards Action. 512-32767: Specification Required. 32768-4294967295: Reserved.
Author Domain Signing Practices (ADSP) Parameters
ADSP Outbound Signing Practices RFC 5617 Registry closed
ADSP Specification Tags RFC 5617 Registry closed
Automated Certificate Management Environment (ACME) Protocol
ACME Account Object Fields RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Authority Token Challenge Types RFC 9447 Specification Required Mary Barnes Aaron Gable
ACME Authorization Object Fields RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Directory Metadata Auto-Renewal Fields RFC 8739 Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
ACME Directory Metadata Fields RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Error Types RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Identifier Types RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Order Auto-Renewal Fields RFC 8739 Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
ACME Order Object Fields RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME RenewalInfo Object Fields RFC 9773 Specification Required Richard Barnes Aaron Gable
ACME Resource Types RFC 8555 Specification Required Richard Barnes Aaron Gable
ACME Validation Methods RFC 8555 Specification Required Richard Barnes Aaron Gable
STAR Delegation CSR Template Extensions RFC 9115 Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
Automatic Responses to Electronic Mail Parameters
Auto-Submitted Header Field Keywords RFC 5436 Specification Required
Auto-Submitted header field optional parameters RFC 3834 IETF Review
Autonomic Control Plane (ACP)
ACP Address Type RFC 8994 Standards Action
Autonomous System (AS) Numbers
16-bit Autonomous System Numbers RFC 1930, RFC 5398, RFC 6996, RFC 7249 RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
32-bit Autonomous System Numbers RFC 1930, RFC 5398, RFC 6793, RFC 6996, RFC 7249 RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
Special-Purpose AS Numbers RFC 7249 IETF Review
Babel Routing Protocol
Babel Address Encodings RFC 8966 0-223: Specification Required. 224-254: Experimental Use. Juliusz Chroboczek Donald Eastlake
Babel Hello Flags Values RFC 8966 Specification Required Juliusz Chroboczek Donald Eastlake
Babel Sub-TLV Types RFC 8966 0-111: Specification Required. 112-126: Experimental Use. 128-239: Specification Required. 240-254: Experimental Use. Juliusz Chroboczek Donald Eastlake
Babel TLV Types RFC 8966 0-223: Specification Required. 224-254: Experimental Use. Juliusz Chroboczek Donald Eastlake
Babel Update Flags Values RFC 8966 Specification Required Juliusz Chroboczek Donald Eastlake
Battery Technologies
Battery Technologies RFC 7577 Expert Review
BGP Monitoring Protocol (BMP) Parameters
BMP Initiation Information TLVs RFC 7854, RFC 9069, RFC 9515, RFC 9736 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Message Types RFC 7854 0-127: Standards Action. 128-250: Specification Required. 251-254: Experimental Use. John G. Scudder Rex Fernando (rex) Paolo Lucente
BMP Peer Down Reason Codes RFC 7854 0-127: Standards Action. 128-250: Specification Required. 251-254: Experimental Use. John G. Scudder Rex Fernando (rex) Paolo Lucente
BMP Peer Flags for Loc-RIB Instance Peer Type 3 RFC 9069 Standards Action
BMP Peer Flags for Peer Types 0 through 2 RFC 7854, RFC 9069 Standards Action
BMP Peer Types RFC 7854 0-127: Standards Action. 128-250: Specification Required. 251-254: Experimental Use. John G. Scudder Rex Fernando (rex) Paolo Lucente
BMP Peer Up Message TLVs RFC 9736 0, 3-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Route Mirroring Information Codes RFC 7854, RFC 9515 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Route Mirroring TLVs RFC 7854, RFC 9515 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Statistics Types RFC 7854, RFC 9515 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Termination Message Reason Codes RFC 7854, RFC 9515 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BMP Termination Message TLVs RFC 7854, RFC 9515 0-32767: Standards Action. 32768-65530: First Come First Served. 65531-65534: Experimental Use.
BGP Shortest Path First (BGP SPF)
BGP-LS-SPF Link NLRI Attribute SPF Status TLV Values RFC 9815 IETF Review
BGP-LS-SPF Node NLRI Attribute SPF Status TLV Values RFC 9815 Expert Review Jie Dong Derek Yeung
BGP-LS-SPF Prefix NLRI Attribute SPF Status TLV Values RFC 9815 IETF Review
Bidirectional Forwarding Detection (BFD) Parameters
BFD Authentication Types RFC 5880 Expert Review Jeff Haas Les Ginsberg
BFD Diagnostic Codes RFC 5880 Expert Review Jeff Haas Les Ginsberg
Bit Index Explicit Replication (BIER)
BIER Algorithm RFC 8401, RFC 9272 0-127: Standards Action. 128-239: Specification Required. 240-254: Private or Experimental Use. Les Ginsberg Chris Hopps
BIER Next Protocol Identifiers RFC 8296 IETF Review
Blocks Extensible Exchange Protocol (BEEP) Parameters
BEEP Features RFC 3080 Expert Review Marshall T. Rose
BEEP Profiles RFC 3080 Expert Review Marshall T. Rose
Bootstrapping Remote Secure Key Infrastructures (BRSKI) Parameters
BRSKI Well-Known URIs RFC 8995 Specification Required Michael Richardson Toerless Eckert
Pledge BRSKI Status Telemetry Attributes RFC 8995 Specification Required Michael Richardson
Border Gateway Protocol (BGP) Parameters
Additional PMSI Tunnel Attribute Flags RFC 7902 Standards Action
ARP/ND Extended Community Flags RFC 9047 Standards Action
BFD Discriminator Optional TLV Type RFC 9026 0-175: IETF Review. 176-249: First Come First Served. 250-254: Experimental Use. 255: IETF Review.
BFD Mode RFC 9026 0-175: IETF Review. 176-249: First Come First Served. 250-254: Experimental Use. 255: IETF Review.
BGP AIGP Attribute Types RFC 7311 Standards Action
BGP BIER TLV and Sub-TLV Types RFC 9793 First Come First Served
BGP CAR NLRI TLV Types RFC 9871 Specification Required Bruno Decraene Swadesh Agrawal
BGP CAR NLRI Types RFC 9871 Specification Required Bruno Decraene Swadesh Agrawal
BGP Data Collection Standard Communities RFC 4384 IETF Review
BGP Error (Notification) Codes RFC 4271, RFC 7313 Standards Action
BGP Error Subcodes RFC 4271 Standards Action
BGP Graceful Restart Flags RFC 4724, RFC 8538 Standards Action
BGP Graceful Restart Flags for Address Family RFC 4724, RFC 8538 Standards Action
BGP Layer 2 Encapsulation Types RFC 6624 0-127: Expert Review. 128-251: First Come First Served. 252-255: Experimental Use.
BGP Layer 2 TLV Types RFC 6624 0-127: Expert Review. 128-251: First Come First Served. 252-255: Experimental Use.
BGP MCAST-VPN Route Types RFC 7441, RFC 6514 Standards Action
BGP Message Types RFC 4271 Standards Action
BGP Non-Transitive Extended Community Types RFC 7153 0x40-0x7f: First Come First Served. 0xc0-0xcf: Reserved for Experimental Use. 0xd0-0xff: Standards Action.
BGP OPEN Optional Parameter Types RFC 5492 IETF Review
BGP Outbound Route Filtering (ORF) Types RFC 5291 0-63: Standards Action. 64-127: First Come First Served. 128-255: Vendor-Specific.
BGP Path Attributes RFC 4271 Standards Action
BGP Prefix-SID Label-Index TLV Flags RFC 8669 Expert Review Acee Lindem Hannes Gredler
BGP Prefix-SID Originator SRGB TLV Flags RFC 8669 Expert Review Acee Lindem Hannes Gredler
BGP Prefix-SID TLV Types RFC 8669 Expert Review Acee Lindem Hannes Gredler
BGP Role Value RFC 9234 IETF Review
BGP Route Refresh Subcodes RFC 7313 0-127: Standards Action. 128-254: First Come First Served.
BGP SRv6 Service SID Flags RFC 9252 IETF Review
BGP Transitive Extended Community Types RFC 7153, RFC 9184 0x00-0x3f: First Come First Served. 0x80-0x82: First Come First Served. 0x83-0x8f: Reserved for Experimental Use. 0x90-0xbf: Standards Action.
BGP Well-known Communities RFC 1997, RFC 8642 0x00000000-0x0000FFFF: Reserved. 0x00010000-0xFFFEFFFF: Private Use. 0xFFFF0000-0xFFFF8000: First Come First Served. 0xFFFF8001-0xFFFFFFFF: Standards Action.
Capability Codes RFC 5492, RFC 8810 1-63: IETF Review. 64-238: First Come First Served. 239-254: Experimental Use.
Context-Specific Label Space ID Type RFC 9573 First Come First Served
DF Alg RFC 8584 RFC Required
DF Election Capabilities RFC 8584 RFC Required
E-Tree Flags RFC 8317 RFC Required
EVPN ESI Label Extended Community Flags RFC 9746 IETF Review
EVPN Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
EVPN Layer 2 Attributes Control Flags RFC 8214 RFC Required
EVPN Link Bandwidth Value Units draft-ietf-bess-evpn-unequal-lb-35 RFC Required
Generic Transitive Extended Community Part 2 Sub-Types RFC 8955, RFC 9184 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Generic Transitive Extended Community Part 3 Sub-Types RFC 8955, RFC 9184 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Generic Transitive Extended Community Sub-Types RFC 7153, RFC 9184 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Layer2 Info Extended Community Control Flags Bit Vector RFC 8395 IETF Review
Long-Lived Graceful Restart Flags for Address Family RFC 9494 Standards Action
Multicast Flags Extended Community RFC 9251 First Come First Served
Multihoming Redundancy Mode RFC 9746 IETF Review
Next Hop Dependent Characteristic Codes draft-ietf-idr-nhc-07 0: Reserved. 1-65399: First Come First Served. 65400-65499: Private Use. 65500-65534: Experimental Use. 65535: Reserved. First Come First Served
Non-Transitive Four-Octet AS-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Non-Transitive IPv4-Address-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Non-Transitive IPv6-Address-Specific Extended Community Types RFC 7153 First Come First Served
Non-Transitive Opaque Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Non-Transitive Transport Class Extended Community Sub-Types RFC 9832 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Non-Transitive Two-Octet AS-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
ORF Entry Bits draft-ietf-idr-vpn-prefix-orf-45 IETF Review
P-Multicast Service Interface (PMSI) Tunnel Attribute Flags RFC 7902 Standards Action
P-Multicast Service Interface Tunnel (PMSI Tunnel) Tunnel Types RFC 7385, RFC 8317 0x00-0x7A: IETF Review. 0x7B-0x7E: Experimental Use. 0x80-0xFA: Composite Tunnel. 0xFB-0xFE: Experimental Use. 0xFF: Standards Action.
Region Identifiers (<R>) RFC 4384 Not defined
SFC Extended Community Sub-Types RFC 9015 First Come First Served
SFC SPI/SI Representation Flags RFC 9015 Standards Action
SFP Association Type RFC 9015 First Come First Served
SFP Attribute TLVs RFC 9015 First Come First Served
Split-Horizon Type RFC 9746 IETF Review
SRv6 Service Data Sub-Sub-TLV Types RFC 9252 0-127: IETF Review. 128-254: First Come First Served. 255: IETF Review.
SRv6 Service Sub-TLV Types RFC 9252 0-127: IETF Review. 128-254: First Come First Served. 255: IETF Review.
Traffic Action Fields RFC 8955 IETF Review
Transitive Four-Octet AS-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Transitive IPv4-Address-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Transitive IPv6-Address-Specific Extended Community Types RFC 7153 First Come First Served
Transitive Opaque Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Transitive Transport Class Extended Community Sub-Types RFC 9832 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
Transitive Two-Octet AS-Specific Extended Community Sub-Types RFC 7153 0x00-0xbf: First Come First Served. 0xc0-0xff: IETF Review.
VPN Prefix ORF TLV Type draft-ietf-idr-vpn-prefix-orf-45 0-127: IETF Review. 128-255: First Come First Served.
Border Gateway Protocol (BGP) Tunnel Encapsulation
BGP Tunnel Encapsulation Attribute Sub-TLVs RFC 9012 1-63: Standards Action. 64-125: First Come First Served. 126-127: Experimental Use. 128-191: Standards Action. 192-252: First Come First Served. 253-254: Experimental Use.
BGP Tunnel Encapsulation Attribute Tunnel Types RFC 9012 First Come First Served
Color Extended Community Color-Only Types RFC 9830 Standards Action
Color Extended Community Flags RFC 9012 Standards Action
Embedded Label Handling Sub-TLVs RFC 9012 Standards Action
Flags Field of NVGRE Encapsulation Sub-TLVs RFC 9012 Standards Action
Flags Field of VXLAN Encapsulation Sub-TLVs RFC 9012 Standards Action
SR Policy Binding SID Flags RFC 9830 Standards Action
SR Policy Segment Flags RFC 9830 IETF Review
SR Policy Segment List Sub-TLVs RFC 9830 IETF Review
SR Policy SRv6 Binding SID Flags RFC 9830 Standards Action
Border Gateway Protocol - Link State (BGP-LS) Parameters
BGP-LS IGP Prefix Flags RFC 9552 Expert Review Adrian Farrel Hannes Gredler
BGP-LS MPLS Protocol Mask RFC 9552 Expert Review Adrian Farrel Hannes Gredler
BGP-LS NLRI and Attribute TLVs RFC 9552 0-255: Reserved (not to be allocated). 256-64999: Expert Review. 65000-65535: Private Use. Hannes Gredler (primary) Adrian Farrel (secondary)
BGP-LS NLRI Types RFC 9552 1-64999: Expert Review. 65000-65535: Private Use. Hannes Gredler (primary) Adrian Farrel (secondary)
BGP-LS Node Flags RFC 9552 Expert Review Adrian Farrel Hannes Gredler
BGP-LS Protocol-IDs RFC 9552 1-199: Expert Review. 200-255: Private Use. Hannes Gredler (primary) Adrian Farrel (secondary)
BGP-LS SR Policy Metric Types RFC 9857 Expert Review Stephane Litkowski Jie Dong
BGP-LS SR Segment Descriptor Types RFC 9857 Expert Review Matthew Bocci Zafar Ali
BGP-LS Well-Known Instance-IDs (OBSOLETE) RFC 9552 Registry closed
SRv6 BGP EPE SID Flags RFC 9514 Standards Action
BPF Instructions
BPF Instruction Conformance Groups RFC 9669 Permanent: Standards Action or IESG Approval. Provisional: Specification Required. Historical: Specification Required. Alexei Starovoitov David Vernet
BPF Instruction Set RFC 9669 Permanent: Standards Action or IESG Approval. Provisional: Specification Required. Historical: Specification Required. Alexei Starovoitov David Vernet
Building Blocks
Building Blocks RFC 3048 Specification Required
Bundle Protocol
Block Processing Control Flags RFC 6255, RFC 9171 Specification Required Scott Burleigh Fred Templin
BPSec BCB-AES-GCM AAD Scope Flags RFC 9173 Specification Required Ken McKeever Edward Birrane
BPSec BIB-HMAC-SHA2 Integrity Scope Flags RFC 9173 Specification Required Ken McKeever Edward Birrane
BPSec Security Context Identifiers RFC 9172 Specification Required Ken McKeever Edward Birrane
Bundle Administrative Record Types RFC 7116, RFC 9713 Specification Required Marc Blanchet Keith Scott
Bundle Block Types RFC 6255, RFC 9171 Specification Required Scott Burleigh Fred Templin
Bundle Custody Signal Reason Codes RFC 6255 Specification Required Scott Burleigh Fred Templin
Bundle Metadata Type Codes RFC 6258 Specification Required Rick Taylor
Bundle Processing Control Flags RFC 6255, RFC 9171 Specification Required Scott Burleigh Fred Templin
Bundle Protocol TCP Convergence-Layer Message Types RFC 7242 RFC Required
Bundle Protocol TCP Convergence-Layer REFUSE_BUNDLE Reason Codes RFC 7242 RFC Required
Bundle Protocol TCP Convergence-Layer SHUTDOWN Reason Codes RFC 7242 RFC Required
Bundle Protocol TCP Convergence-Layer Version 4 Message Types RFC 9174 RFC Required
Bundle Protocol TCP Convergence-Layer Version 4 MSG_REJECT Reason Codes RFC 9174 Specification Required Brian Sipos Rick Taylor
Bundle Protocol TCP Convergence-Layer Version 4 SESS_TERM Reason Codes RFC 9174 Specification Required Brian Sipos Rick Taylor
Bundle Protocol TCP Convergence-Layer Version 4 Session Extension Types RFC 9174 Expert Review Brian Sipos Rick Taylor
Bundle Protocol TCP Convergence-Layer Version 4 Transfer Extension Types RFC 9174 Expert Review Brian Sipos Rick Taylor
Bundle Protocol TCP Convergence-Layer Version 4 XFER_REFUSE Reason Codes RFC 9174 Specification Required Brian Sipos Rick Taylor
Bundle Protocol TCP Convergence-Layer Version Numbers RFC 7242 RFC Required
Bundle Protocol URI Scheme Types RFC 9171 Standards Action
Bundle Status Report Flags RFC 6255 RFC Required
Bundle Status Report Reason Codes RFC 6255, RFC 9171 Specification Required Scott Burleigh Fred Templin
CBHE Service Numbers RFC 7116 0-63: Specification Required. 1024-65535: Specification Required. Marc Blanchet Keith Scott
Ciphersuite Flags RFC 6257 Specification Required Stephen Farrell Edward Birrane
Ciphersuite Numbers RFC 6257 Specification Required Stephen Farrell Edward Birrane
Ciphersuite Parameters and Results Type Registry RFC 6257 Specification Required Stephen Farrell Edward Birrane
Primary Bundle Protocol Version RFC 6255 RFC Required
C-DNS DNS Capture Format
C-DNS Address Event Types RFC 8618 Expert Review Jim Hague Sara Dickinson John Dickinson
C-DNS Response Flags RFC 8618 Expert Review Jim Hague Sara Dickinson John Dickinson
C-DNS Storage Flags RFC 8618 Expert Review Jim Hague Sara Dickinson John Dickinson
C-DNS Transports RFC 8618 Expert Review Jim Hague Sara Dickinson John Dickinson
Caller-ID Numbering Plans
Caller-ID Numbering Plans Tokens RFC 3939 Standards Action
Candidate Access Router Discovery (CARD) Parameters
AVP Type Registry RFC 4065 Expert Review
Experimental Mobility Protocol Subtype Registry RFC 4065 Specification Required and IESG Review
Layer 2 Access Technology Identifier Registry RFC 4065 Specification Required
Captive Portals
Captive Portal API Keys RFC 8908 Specification Required Tommy Pauly Darshak Thakore Martin Thomson
CBOR Encoded X.509 (C509)
C509 Certificate Policies draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 32767: Expert Review. 32768-65535: Reserved for Private Use.
C509 Certificate Types draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 Certification Request Templates Types draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 Certification Request Types draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 CR Attributes draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 32767: Expert Review. 32768-65535: Reserved for Private Use.
C509 Extended Key Usages draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 32767: Expert Review. 32768-65535: Reserved for Private Use.
C509 Extensions draft-ietf-cose-cbor-encoded-cert-20 0: Expert Review. 1 - 23: IETF Review with Expert Review. 24 - 32767: Expert Review. 32768 - 65535: Reserved for Private Use.
C509 General Names draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 Information Access draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 Policies Qualifiers draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 32767: Expert Review. 32768-65535: Reserved for Private Use.
C509 Private Key Types draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 Public Key Algorithms draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
C509 RDN Attributes draft-ietf-cose-cbor-encoded-cert-20 0 - 23: IETF Review with Expert Review. 24 - 32767: Expert Review. 32768 - 65535: Reserved for Private Use.
C509 Signature Algorithms draft-ietf-cose-cbor-encoded-cert-20 -65536 to -25: Expert Review. -24 - 23: IETF Review with Expert Review. 24 to 65535: Expert Review.
CBOR Object Signing and Encryption (COSE)
COSE Algorithms RFC 9053, RFC 9054, RFC 9864 §4.2 Integers less than -65536: Private Use. Integer values from -65536 to -257: Specification Required. Integer values between -256 and 255: Standards Action With Expert Review. Integer values from 256 to 65535: Specification Required. Integer values greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Göran Selander Derek Atkins Sean Turner
COSE Elliptic Curves RFC 9053 Integers less than -65536: Private Use. Integer values -65536 to -257: Specification Required. Integer values -256 to 255: Standards Action With Expert Review. Integer values 256 to 65535: Specification Required. Integer values greater than 65535: Expert Review. Göran Selander Derek Atkins Sean Turner
COSE Header Algorithm Parameters RFC 9053 Expert Review Göran Selander Derek Atkins Sean Turner
COSE Header Parameters RFC 9052 Integers less than -65536: Private Use. Integer values in the range -1 to -65536: delegated to the COSE Header Algorithm Parameters registry. Integer values between 1 and 255: Standards Action With Expert Review. Integer values from 256 to 65535: Specification Required. Integer values greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Carsten Bormann
COSE Key Common Parameters RFC 9052 Integers less than -65536: Private Use. Integer values in the range -65536 to -1: used for key parameters specific to a single algorithm delegated to the COSE Key Type Parameters registry. Integer values between 0 and 255: Standards Action With Expert Review. Integer values from 256 to 65535: Specification Required. Integer values greater than 65535: Expert Review. Strings of length 1: Standards Action With Expert Review. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Francesca Palombini Carsten Bormann
COSE Key Type Parameters RFC 9053 Expert Review Göran Selander Derek Atkins Sean Turner
COSE Key Types RFC 9053 Expert Review Göran Selander Derek Atkins Sean Turner
COSE Verifiable Data Structure Algorithms RFC 9942 Specification Required Mike Jones Orie Steele
COSE Verifiable Data Structure Proofs RFC 9942 Specification Required Mike Jones Orie Steele
CBOR Web Token (CWT)
CBOR Web Token (CWT) Claims RFC 8392 Integer values from -256 to 255: Standards Action. Integer values from -65536 to -257: Specification Required. Integer values from 256 to 65535: Specification Required. Integer values greater than 65535: Expert Review. Strings of length 1: Standards Action. Strings of length 2: Specification Required. Strings of length greater than 2: Expert Review. Mike Jones Hannes Tschofenig Ludwig Seitz
CWT Confirmation Methods RFC 8747 Specification Required Ludwig Seitz Mike Jones
CWT Status Mechanisms draft-ietf-oauth-status-list-21 Specification Required
Centralized Conferencing Manipulation Protocol (CCMP) Parameters
CCMP Message Types RFC 6503 Specification Required
CCMP Response Codes RFC 6503 Specification Required
CERT RR Certificate Types
CERT RR Certificate Types RFC 4398 0x0000-0x00FF: Standards Action. 0xFF00-0xFFFF: Standards Action. 0x0100-0xFEFF: IETF Review.
Certificate Management Protocol (CMP)
CMP Well-Known URI Path Segments RFC 9811 Specification Required Hendrik Brockhaus David von Oheimb John Gray
Channel-Binding Types
Channel-Binding Types RFC 5056 Expert Review Nicolas Williams
Character Sets
Character Set Registrations RFC 2978 Expert Review Martin Dürst
Character Sets RFC 2978 Expert Review Martin Dürst
Character Sets Mailing List Information RFC 2978 Expert Review
Cisco Service Level Assurance Protocol
Cisco SLA Protocol Address Family Registry RFC 6812 Specification Required
Cisco SLA Protocol Authenticator Modes Registry RFC 6812 RFC Required
Cisco SLA Protocol CSLD Command Registry RFC 6812 RFC Required
Cisco SLA Protocol Measurement-Type Registry RFC 6812 RFC Required
Cisco SLA Protocol Roles Registry RFC 6812 RFC Required
Cisco SLA Protocol Status Types Registry RFC 6812 First Come First Served
Cisco SLA Protocol Version Number Registry RFC 6812 RFC Required
CoAP-EAP
CoAP-EAP Cipher Suites RFC 9820 -65536..-25: Specification Required. -24..-21: Private Use. -20..23: Standards Action with Expert Review. 24..65535: Specification Required. Marco Tiloca Alan DeKok
CoAP-EAP Information Elements RFC 9820 0-23: Standards Action with Expert Review. 24-49: Private Use. 50-65000: Specification Required. 65001-65535: Experimental Use. Marco Tiloca Alan DeKok
Common Architecture Label IPv6 Security Option (CALIPSO)
CALIPSO Domain of Interpretation (DOI) RFC 5570 1:0:0:0 - 254:255:255:255: Expert Review. 255:0:0:0 - 255:255:255:255: IESG Approval.
Common Name Resolution Protocol (CNRP) Parameters
Properties RFC 3367 First Come First Served
Property Types RFC 3367 First Come First Served
Status Messages RFC 3367 First Come First Served
Common Open Policy Service (COPS) Protocol
A-types RFC 3182 0-127: IETF Review. 128-255: Private Use.
ADMISSION_PRI (P-Type 0x05) Error Codes RFC 6401 0-127: IETF Review. 128-240: First Come First Served.